Floating point division by zero when first run import (python 3.6) RAD 10.2 x64

[RavWin]

RAD Studio 10.2
Testing script:

import numpy as np
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt

example data

mu = 100 # mean of distribution
sigma = 15 # standard deviation of distribution
x = mu + sigma * np.random.randn(10000)
num_bins = 50

the histogram of the data

n, bins, patches = plt.hist(x, num_bins, normed=1, facecolor='green', alpha=0.5)

add a 'best fit' line

y = mlab.normpdf(bins, mu, sigma)
plt.plot(bins, y, 'r--')
plt.xlabel('Smarts')
plt.ylabel('Probability')
plt.title(r'Histogram of IQ: $\mu=100$, $\sigma=15$')

Tweak spacing to prevent clipping of ylabel

plt.subplots_adjust(left=0.15)
plt.show()

Sample Project Demo01 when Execute it generates error floating point division by zero. Second time it runs ok.
Crash is on 5305 string in PythonEngine
Result := PyRun_String(PAnsiChar(CleanString(command)), mode, _globals, _locals);

[pyscripter]

You need to call MaskFPUExceptions before importing numpy.

See https://stackoverflow.com/questions/3933851/nan-giving-an-error-depending-on-python-startup for details.

[RavWin]

Thanks.
It does help in Delphi2010 with 32 bit app.
But in RAD 10.2 with x64 app it crashes on the same simple script

from bokeh.plotting import figure, output_file, show

prepare some data

x = [1, 2, 3, 4, 5]
y = [6, 7, 2, 4, 5]

output to static HTML file

output_file("lines.html")

create a new plot with a title and axis labels

p = figure(title="simple line example", x_axis_label='x', y_axis_label='y')

add a line renderer with legend and line thickness

p.line(x, y, legend="Temp.", line_width=2)

show the results

show(p)

[RavWin]

You need to call MaskFPUExceptions before importing numpy.

See https://stackoverflow.com/questions/3933851/nan-giving-an-error-depending-on-python-startup for details.

It helps for Delphi2010 only.

[pyscripter]

Your script runs fine inside pyscripter's internal engine (python 3.7). PyScripter uses P4D and is a 64bit Delphi app compiled with Delphi 10.3. So I cannot reproduce the issue.

PyScripter calls MaskFPUExceptions before loading the python library and before executing each script.

I am not sure it is related but have you seen the wiki page on manifest files?

[RavWin]

PyScripter calls MaskFPUExceptions before loading the python library and before executing each script.

I have installed Python_XE7.dpk in RAD Studio 10.2, and modified Demo01
procedure TForm1.Button1Click(Sender: TObject);
var
OldControlWord: Word;
begin
OldControlWord := Get8087CW();
Set8087CW($133F);
try
PythonEngine1.ExecStrings( Memo1.Lines );
finally
Set8087CW(OldControlWord);
end;
end;

Is it correct MaskFPUExceptions method?
With 32 bit version it works OK.
but in Python_XE7 no option for x64 platfom to Install VCL components. May be problem in this?
Only with x32 version of Python_XE7.dpk installed project could be opened.

I am not sure it is related but have you seen the wiki page on manifest files?
If you mean https://github.com/pyscripter/python4delphi/tree/master/PythonForDelphi, then yes.

[pyscripter]

MaskFPUExceptions is a function in PythonEngine.pas. No need to provide your own.

Regarding the Vcl components, Delphi is a 32 bit application. You only compile the package for 32 bit. You can design the forms in 32 bit and then compile for 64 bits.

[RavWin]

MaskFPUExceptions is a function in PythonEngine.pas. No need to provide your own.

Regarding the Vcl components, Delphi is a 32 bit application. You only compile the package for 32 bit. You can design the forms in 32 bit and then compile for 64 bits.

Oh, I see! Thank you very much! Now it works pretty well!

[IbrahimAdham]

same problem with Delphi 11.3 Python 11.3.8
MaskFPUExceptions(true);
plt.show();
MaskFPUExceptions(false);
solved the problem